Which is longer 5 miles or 10 kilometers?
The exact conversion figure is
I find it handy to use the first few terms of the Fibonacci sequence as an approximation for converting between miles and kilometers.
The Fibonacci sequence starts
#1, 1, 2, 3, 5, 8, 13, 21, 34,...#
The ratio of pairs of consecutive terms tends towards the Golden ratio
Hence we find